From 2901d27235c9406da285a7c50ad5a9499c50f32e Mon Sep 17 00:00:00 2001
From: Progi1984 <progi1984@gmail.com>
Date: Wed, 1 Jul 2015 16:13:48 +0200
Subject: [PATCH] Added String::chr for suppporting Unicode Characters

---
 src/Common/String.php             | 22 ++++++++++++++++++++++
 tests/Common/Tests/StringTest.php | 13 +++++++++++++
 2 files changed, 35 insertions(+)

diff --git a/src/Common/String.php b/src/Common/String.php
index 598db4b..aa7b03e 100644
--- a/src/Common/String.php
+++ b/src/Common/String.php
@@ -74,4 +74,26 @@ public static function numberFormat($number, $decimals)
     {
         return number_format($number, $decimals, '.', '');
     }
+    
+    /**
+     * @param int $dec
+     * @link http://stackoverflow.com/a/7153133/2235790
+     * @author velcrow
+     */
+    public static function chr($dec)
+    {
+        if ($dec<=0x7F) {
+            return chr($dec);
+        }
+        if ($dec<=0x7FF) {
+            return chr(($dec>>6)+192).chr(($dec&63)+128);
+        }
+        if ($dec<=0xFFFF) {
+            return chr(($dec>>12)+224).chr((($dec>>6)&63)+128).chr(($dec&63)+128);
+        }
+        if ($dec<=0x1FFFFF) {
+            return chr(($dec>>18)+240).chr((($dec>>12)&63)+128).chr((($dec>>6)&63)+128).chr(($dec&63)+128);
+        }
+        return '';
+    }
 }
diff --git a/tests/Common/Tests/StringTest.php b/tests/Common/Tests/StringTest.php
index 5e2d24b..fcad14d 100644
--- a/tests/Common/Tests/StringTest.php
+++ b/tests/Common/Tests/StringTest.php
@@ -43,4 +43,17 @@ public function testNumberFormat()
         $this->assertEquals('2.1', String::numberFormat('2.12', 1));
         $this->assertEquals('1234', String::numberFormat(1234, 1));
     }
+    
+    public function testChr()
+    {
+        $this->assertEquals('A', String::chr(65));
+        $this->assertEquals('A', String::chr(0x41));
+        $this->assertEquals('é', String::chr(233));
+        $this->assertEquals('é', String::chr(0xE9));
+        $this->assertEquals('⼳', String::chr(12083));
+        $this->assertEquals('⼳', String::chr(0x2F33));
+        $this->assertEquals('🌃', String::chr(127747));
+        $this->assertEquals('🌃', String::chr(0x1F303));
+        $this->assertEquals('', String::chr(2097152));
+    }
 }